Honeywell 05704-A-0121 Four relay interface card

PRINCIPAL FEATURES

The 5704F Series Control System is part of the System 57 family and is designed to monitor field mounted industrial fire detectors. 

Single Channel Control Card

The Single Channel Control Card carries out the control functions for a single loop of gas detection as follows:

a. Processes the incoming sensor drive module signal.

b. Displays the signal level on the front panel liquid crystal display.

c. Compares the signal level with pre-defined alarm limits.

d. When the pre-defined alarm limits are exceeded, raises the alarms

by lighting up front panel LEDs and operating optional connected relays.

e. Informs other cards with the alarm status information.

f. Self validates the operation of its circuit components, software

operation and the condition of the sensor.

Single Channel Control Card Physical Layout

The physical layout of the Single Channel Control Card is shown below.

The Sensor Drive Modules plug into the 14-way connectors J1 and J2

while the Analogue Output Module, when fitted, plugs into J3 and J4.

Link LK1, available on MkII cards only, is used when individually powering

control cards See Chapter 4, Section 16.2.

Architecture

The system consists of a single 1'' (2.54 cm) wide board mounted in a ruggedized rack designed for European style cabinets.

Two rack widths are available:

a. 19-inch with 17 card slots for up to 16 channel control cards and one engineering card.

b. Half 19 inches with 9 card slots for up to 8 channel control cards and 1 engineering card.

Each subrack contains one engineering card and one DC input card to form the rack system.

The system is designed to accommodate different customer wiring configurations, and for this reason, 

the control functions are separated from the relays and field wiring connections.

Therefore, single channel gas detection consists of :

a. Sensor Driver Module

For compatibility with a wide range of input and sensor types, the circuitry required to control the sensors is mounted on separate plug-in sensor driver modules.

These modules plug directly into the channel control card and are factory installed. 

Two different modules are available, one for catalytic inputs and the other for 4 - 20mA inputs.

b. Single Channel Control Cards

Each single-channel control card is self-contained and contains all the necessary electronic circuitry to provide sensor actuation, 

alarm detection, and gas level indication for that gas detection channel.

c. Field Interface or Relay Card

Field interface/relay cards provide interface connections between the control card and the respective field-connected gas sensors. 

In addition, relay cards provide alarm outputs for field connections.

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